Forumlar / Cotonti / Support / stoopid question

I have 2 page fields:

{PAGE_AUTHOR} and {PAGE_SOURCE} and I want a small text (None, or No information available) to appear when both fields are empty.

But when one field is filled in, that field must appear, and the text must disappear.

is that possible with the IF/ENDIF tags?

I can do it for both fields seperately, but what I can't figure out is how to do that with both fields at once..

Does it make any sense? look at the example below, maybe you'll see what I mean:

<!-- IF {PAGE_AUTHOR} -->
    <strong class="small">{PHP.L.Author}:</strong> {PAGE_AUTHOR}
    <hr />
<!-- ELSE -->    
No information available
<!-- ENDIF -->
<!-- IF {PAGE_SOURCE} -->
    <strong class="small">{PAGE_SOURCE_TITLE}:</strong><br /><br />
    <div style="font-size:10px;"><a href="{PAGE_SOURCE}" target="_blank">{PAGE_SOURCE}</a></div>
    <hr />
<!-- ENDIF -->